jones_supa writes: Today Portal 2, a Source-based game that has been still missing a Linux version, got a public beta release. The Steam game product page doesn't yet say the game supports Linux. To access the beta for Linux, right-click the game in Steam, select Properties and go to the Betas tab. Valve hasn't published the Linux system requirements for Portal 2 yet, but WebUpd8 tested it using Intel HD 3000 graphics under Ubuntu and it worked pretty well.Link to Original Source